It really depends on how the infrastructure is built. For instance at our WISP we limit tower radius distance to 1 Mile. This allows us to push higher speeds and have lower latency. I do agree; many traditional WISPs try to maximize tower distance to CPE's in an effort to maximize their ROI, however it comes at the cost of a decreased customer experience (though in some areas this is unavoidable).

We use Cambium ePMP hardware (the Motorola team split into UBNT and Cambium) in 1 mi radius' and see ~40-90 Mbps down and 10-40 Mbps up.